JP7162768B1 - Apparatus, method, and program for managing settings of wireless communication service provided using wireless communication infrastructure of MNO - Google Patents

Abstract

A method for managing configuration of a wireless communication service determines a determination procedure in the MNO of values of parameters used in a low power consumption state. A device (200) first receives, from a subscriber terminal (210), a first set value A of a parameter used in a power consumption state (S301 to S302). Next, the device 200 transmits to the HSS 230 a setting request for holding a second setting value B different from A (S303), and then transmits a CLR including a reattach designation to the MME 220. (S304). The MME 220 transmits a detach request to the subscriber terminal 210 and notifies it after re-attaching (S305 to S309). This notification includes the third set value C of the parameter determined by the MME 220 . The device 100 that has received the reattach completion notification receives C from the subscriber terminal 210 (S310 to S314), and uses A, B, and C to determine the determination procedure (S315). [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to an apparatus, method, and program for managing settings of wireless communication services provided using a wireless communication infrastructure possessed by an MNO.

Due to the increasing demand for wireless connection of various devices to IP networks such as the Internet, there are many wireless access technologies for IoT devices. 3GPP, a standard organization for wireless communication, has also established standards such as LTE-M and NB-IoT as standards for cellular LPWA (Low Power Wide Area) based on LTE technology, and commercial use has begun.

As low power consumption is generally desired in IoT devices, 3GPP has standardized PSM (Power Saving Mode) in release 12 and eDRX (extended discontinuous reception) in release 13 for cellular LPWA.

PSM defines a hibernate state in addition to a connected (RRC_CONNECTED) state and an idle (RRC_IDLE) state as IoT device states. Power consumption is suppressed by turning off power to circuits used for information collection, such as RF circuits and baseband circuits, without performing even minimum information collection such as searching. Here, it is possible to set a first period Tactive from transitioning to the idle state to transitioning to the resting state, and a second period Tpsm from transitioning to the idle state until exiting the resting state. A hibernating IoT device uses a TAU ( Tracking Area Update). The second period Tpsm can be set up to 310 hours in current specifications.

In the idle state, eDRX temporarily turns off power to circuits such as RF circuits and baseband circuits after a first period of time Tptw from a certain point in time and then until a second period of time Tedrx has passed from that point in time. This reduces power consumption. The second period Tedrx can be set up to 10485.76 seconds in current specifications. Note that the subscript of Tptw is an acronym for paging time window.

By using functions conforming to the PSM and eDRX standards, it is possible to reduce the power consumption of IoT devices. You may want to set for each of the above periods.

However, the parameter values that are ultimately set in IoT devices differ depending on the policy of each carrier, that is, the MNO (mobile communication operator), and are determined by the equipment included in the MNO's wireless communication infrastructure. This policy is unknown to MVNOs (mobile virtual network operators) (see Figure 1) that provide wireless communication services for accessing IP networks such as the Internet using the wireless communication infrastructure owned by . If there is an MVNE (mobile virtual network service provider) between the MNO and the MVNO that provides support services for the smooth operation of the MVNO, the policy is similarly unknown to the MVNE.

The present invention has been made in view of the above points, and its object is to provide an apparatus, method, or method for managing settings of wireless communication services provided by using the wireless communication infrastructure of an MNO. The program determines the determination procedure in the MNO of the values of one or more parameters used in the low power consumption state.

In addition, as states for low power consumption, the current specifications include an idle state and a hibernation state, and two types of parameter values or timer values can be set for each, which will be defined in future specifications. are referred to herein more generally as "low power consumption states".

In order to achieve such an object, a first aspect of the present invention is a method for managing settings of a wireless communication service provided using a wireless communication infrastructure possessed by an MNO, the server comprising: A second setting value different from the first setting value of the parameter used in the low power consumption state held in the subscriber terminal having the SIM is assigned to the subscriber identifier included in the SIM, in the subscriber information database. Sending a request to the subscriber terminal to detach the subscriber identifier, which requires re-attachment, to the subscriber terminal; receiving a re-attach completion notification from the MNO via the subscriber information database; requesting the subscriber terminal for a third set value of the parameter after re-attach; and determining, at least in part, a procedure for determining a value of said parameter at said MNO using said setpoint, said second setpoint and said third setpoint.

A second aspect of the present invention is the method of the first aspect, further comprising the step of requesting and receiving the first set value from the subscriber terminal by the server.

A third aspect of the present invention is the method of the first or second aspect, wherein the first setting value and the second setting value are preset for the parameter in the MNO. different from the set value.

A fourth aspect of the present invention is the method according to the third aspect, wherein a request for setting the first setting value to Null is sent to the subscriber terminal before the setting request. sending a request to the subscriber information database to set the second setting value to Null; and detaching the subscriber identifier to the subscriber terminal, , sending a detach request that requires reattachment; receiving a reattachment completion notification from the MNO through the subscriber information database; requesting a setting value for said parameter at a later time; and storing said setting value as a preset setting value for said parameter at said MNO.

A fifth aspect of the present invention is the method of the fourth aspect, wherein the subscriber terminal sets the first setting value to a value different from the setting value preset for the parameter. Further comprising sending a request to reconfigure.

A sixth aspect of the present invention is the method according to any one of the first to fifth aspects, wherein after requesting the third setting value, the third setting value is set to the first setting value. if equal to a value, sending a request to the subscriber terminal to set the first setting value to Null; and detaching the subscriber identifier towards the subscriber terminal, comprising: sending a detach request that requires reattachment; receiving a reattachment completion notification from the MNO via the subscriber information database; requesting a new third set value of said parameter in the MNO; and using said new third set value to further determine a procedure for determining the value of said parameter at said MNO.

A seventh aspect of the present invention is the method according to any one of the first to fifth aspects, wherein after requesting the third setting value, the third setting value is set to the second setting value. if equal to a value, sending a request to the subscriber information database to set the second setting value to Null; and detaching the subscriber identifier to the subscriber terminal. , sending a detach request that requires reattachment; receiving a reattachment completion notification from the MNO through the subscriber information database; requesting a new third set value of said parameter at a later time; and using said new third set value to further determine a procedure for determining the value of said parameter at said MNO.

Further, an eighth aspect of the present invention is the method of any one of the first to seventh aspects, wherein the determined decision procedure pattern, the MNO identifier that identifies the MNO, and the parameters in the MNO are An association with at least one of the mobility management facility identifiers identifying the determined mobility management facility is stored.

A ninth aspect of the present invention is a program for causing a server to execute a method for managing settings of a wireless communication service provided using a wireless communication infrastructure of an MNO, the method comprising: assigns to the subscriber information database a second setting value of a parameter used in the low power consumption state held in the subscriber terminal having the SIM, which is different from the first setting value of the parameter, the subscriber included in the SIM sending a request to set the identifier to be associated and held; and sending a request to the subscriber terminal to detach the subscriber identifier, the detach requiring re-attachment. , receiving a re-attach completion notification from the MNO via the subscriber information database; requesting the subscriber terminal for a third set value of the parameter after re-attach; and determining, at least in part, a procedure for determining a value of said parameter at said MNO using one setpoint, said second setpoint and said third setpoint.

A tenth aspect of the present invention is a device for executing a method for managing settings of a wireless communication service provided using a wireless communication infrastructure possessed by an MNO, wherein a subscriber information database stores On the other hand, in order to hold a second setting value different from the first setting value of the parameter used in the low power consumption state, which is held in the subscriber terminal having the SIM, in association with the subscriber identifier included in the SIM. and sending a request to the subscriber terminal for detachment of the subscriber identifier that requires re-attachment, so that the subscriber information database is retrieved from the MNO to request the subscriber terminal for a third set value of the parameter after re-attach, and to obtain the first set value, the second set value and the third set value of the parameter after the re-attach. 3 settings are used to at least partially determine the procedure for determining the values of the parameters in the MNO.

According to one aspect of the present invention, a first setting of parameters used in a low power consumption state held in a subscriber terminal having a SIM for a subscriber information database connected to a wireless communication infrastructure owned by an MNO After making a setting request to hold a second set value different from the value in association with the subscriber identifier included in the SIM, the subscriber terminal is reattached, and the subscriber terminal is sent via the MNO. to receive the third set value of the parameter. Then, by using the first set value, the second set value, and the third set value, at least partially determine the procedure in the MNO for determining the value of the parameter set in the subscriber terminal. be able to.

FIG. 2 is a diagram for explaining an MVNO that provides wireless communication services using a wireless communication infrastructure owned by an MNO; 1 illustrates a system according to an embodiment of the invention; FIG. It is a figure which shows the flow of the management method concerning one Embodiment of this invention. It is a figure which shows the flow of an example of determination of the determination procedure concerning one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a system according to one embodiment of the invention. A device 200 included in the system is a device for managing settings of wireless communication services provided using the wireless communication infrastructure of MNO, and is capable of communicating with subscriber terminals 210 having SIMs. Various methods are conceivable, but one preferable example is communication by SMS. The subscriber terminal 210 may respond to a later-described request from the device 200 when the telephone number of the sender of the SMS is a predetermined number. Also, the subscriber terminal 210 communicates with the MME 220, which is equipment included in the wireless communication infrastructure of the MNO, in order to establish a communication connection by a cellular system such as cellular LPWA using the SIM. As used herein, the term "system" includes at least some of the components shown in FIG.

More specifically, the subscriber terminal 210 transmits an attach request to the MME 220, and the MME 220 receiving the attach request includes a subscriber identifier such as IMSI included in the attach request in the HSS (Home Subscriber Server) 230. Make a request called ULR (Update Location Request). The HSS 230 stores subscriber information and location information in association with the subscriber identifier, and the subscriber information may include setting values for one or more parameters used in the low power consumption state. A ULA (Update Location Answer) is transmitted from the HSS 230 to the MME 220 as a response to the ULR, and the ULA may contain at least part of the setting values of the one or more parameters. The MME 220 that has received the ULA transmits a notification that the attachment has been made to the subscriber terminal 210 . The notification includes setting values of one or more parameters used in the low power consumption state determined by the MME 220 .

Although there are four types of parameters in the current specifications, the following description focuses on any one parameter for the sake of simplicity. In addition, it is preferable to determine the decision procedure in the MNO for all parameters by the management method according to the present embodiment, but even if only some parameters are estimated, the advantages of the present invention can be enjoyed. add.

The attach request transmitted from the subscriber terminal 210 can include setting values of parameters used in the low power consumption state, and the MME 220 receives the values received from the subscriber terminal 210, the values received from the HSS 230, and the MME 220 , the final value to be set for the subscriber terminal 210 is determined according to the policy of each MNO.

The device 200 can communicate with the HSS 230, for example, according to the HTTP protocol, more specifically using a REST API. Both the device 200 and the HSS 230 can be facilities of an MVNO or MVNE that provides wireless communication services using the wireless communication infrastructure possessed by the MNO. Device 200 can be one or more instances on a cloud or public cloud, and HSS 230 can also be one or more instances on the same or different cloud or public cloud. As used herein, the term "cloud" refers to a system that can dynamically provision and provide computing resources such as CPU, memory, storage, and network bandwidth on demand on a network. For example, a cloud can be used by AWS (registered trademark) or the like. A "public cloud" is a cloud that can be used by multiple tenants.

The device 200 includes a communication unit 201 such as a communication interface, a processing unit 202 such as a processor and a CPU, and a storage unit 203 including a storage device or storage medium such as a memory or a hard disk. It can be configured by running Device 200 may include one or more devices, computers, instances or servers. Also, the program may include one or more programs, and may be recorded on a computer-readable storage medium to be a non-transitory program product. The program can be stored in a storage device or storage medium such as the database 204 accessible from the storage unit 203 or the device 200 via the IP network, and can be executed by the processing unit 202 . Data described below as being stored in storage 203 may be stored in database 204, and vice versa.

In the explanation so far, we have used the technical terms of 4G, “MME” and “HSS”, but in 5G, the former is “AMF (Access and Mobility Management Function)” and the latter is “UDM (Unified Data Management Function)”. )” and “UDR (Unified Data Repository)”. Although the terms MME and HSS are used in the following explanation, the technical terms may change due to the development of communication standards, and the former does not exclude those with equivalent functions. equipment", and the latter is sometimes called a "subscriber information database".

First, the device 200 requests the subscriber terminal 210 for the first set value A of the parameter used in the power consumption state held in the subscriber terminal 210 (S301), and receives it (S302). . If the device 200 already stores the first setpoint A, this step is not necessary. The first set value A can be obtained by executing an AT command in the subscriber terminal 210. FIG.

Next, the device 200 associates the second setting value B different from the first setting value A with the subscriber identifier included in the SIM of the subscriber terminal 210 and holds the HSS 230 as the value of the parameter. A setting request for the purpose is transmitted (S303). The HSS 230 may manage subscriber identifiers on a group-by-group basis, or specify a group identifier to hold or change the value of the parameter on a group-by-group basis.

Then, the device 200 transmits a CLR (Cancel Location Request) for canceling the location registration of the SIM identifier to the MME 220, which is equipment included in the wireless communication infrastructure of the MNO, via the HSS 230 (S304). The CLR includes a specification that reattach is required after location deregistration, which specification can be provided, for example, by setting the 'Reattach-Required' bit in the CLR-Flag. Location deregistration by CLR removes subscriber information in addition to location information. The MME 220 that has received the CLR transmits a detach request to the subscriber terminal 210 (S305). The detach request includes a specification that reattach is required as well, based on the specification contained in the CLR.

The subscriber terminal 210 then sends a re-attach request to the MME 220 (S306), and the MME 220 sends a ULR to the HSS 230 (S307). The HSS 230 returns the ULA to the MME 220 (S308), and the MME 220 notifies the subscriber terminal 210 of the re-attachment (S309). This notification includes the third set value C of the parameter determined by the MME 220 . The subscriber terminal 210 then transmits a re-attach completion notification to the device 220 via the MME 220 and HSS 230 (S310 to S312).

The device 200 that has received the re-attach completion notification requests the subscriber terminal 210 for the third set value C of the parameter (S313) and receives it (S314). Then, the device 200 uses the first set value A, the second set value B, and the third set value C to determine the parameter value determination procedure in the MNO (S315). Apparatus 200 has access to a program capable of executing at least part of the algorithm for determining the decision procedure described below.

The following five patterns are given for the procedure of how to determine the parameter values to be used in the low power consumption state from among the first set value A, the second set value B, and the third set value C. be done. Here, UE represents the subscriber terminal 210, and patterns differ depending on which one of the setting values held in the UE, MME, and HSS is prioritized.

When the third setting value C is different from the first setting value A and the second setting value B, the MME 220 can determine that pattern 1 is adopted. When the third set value C is equal to the first set value A, the MME 220 can determine that pattern 1, pattern 2, or pattern 4 is employed. When the third set value C is equal to the second set value B, the MME 220 can determine that pattern 1, pattern 3, or pattern 5 is employed.

If the first setting value A and the second setting value B are set to Null and reattachment is executed, the third setting value C is set to the parameter in the MME 220 in advance regardless of the pattern. It becomes the set value. If the preset values held in advance in the MME 220 to MNO and the first set value A and the second set value B are reset to different values, the third set value C becomes the first set value. If it is equal to the set value A, the MME 220 can determine that pattern 2 or pattern 4 is adopted. Similarly, when the third set value C is equal to the second set value B, the MME 220 can determine that pattern 3 or pattern 5 is employed.

If the third setpoint C is equal to the first setpoint A, then the third setpoint C will either be the preset value in the MNO or the second setpoint B if the first setpoint A is also set to Null. If it is the former, it can be determined that it is pattern 2, and if it is the latter, it can be determined that it is pattern 4. Similarly, if the third setpoint C is equal to the second setpoint B, then if the second setpoint B is also set to Null, the third setpoint C will either be the preset value at the MNO or the first It can be determined to be either set value A, and pattern 3 if the former, and pattern 5 if the latter.

If the reattachment with the first setting value A and the second setting value B set to Null has not been performed in advance, when the third setting value C is equal to the first setting value A, the first If setting value A is set to Null, then the third setting value C will be either the preset value in the MNO or the second setting value B, with pattern 1 or 2 for the former and pattern 4 for the latter. It can be determined that there is Similarly, when the third setpoint C is equal to the second setpoint B, if the second setpoint B is set to Null, then the third setpoint C will either be the preset value at the MNO or the first setting. It can be determined to be one of the values A, and it can be determined that it is pattern 1 or 3 if it is the former, and that it is pattern 5 if it is the latter.

In this way, it is often not possible to specify which pattern it is simply by setting the second set value B different from the first set value A and re-attaching once. , and before or after that, at least one of the first set value A and the second set value B is set to Null, and then re-attaching is performed, so that pattern determination proceeds.

According to the 3GPP standard procedures, the setting values determined by the MME 220 are not notified to the HSS 230. Therefore, in the MVNO or MVNE that provides wireless communication services using the wireless communication infrastructure possessed by the MNO, what setting values are finally used? It is unclear whether the subscriber terminal 210 is operating or not, which may cause battery consumption more than expected or unexpected troubles. According to the method of the present embodiment, the setting value determination procedure can be determined, and the subscriber of the wireless communication service can perform more appropriate device management.

FIG. 4 shows an example flow of determination in the determination procedure described above. First, the device 100 acquires the third setting value C1 while setting the first setting value A and the second setting value B to Null (S401). The value C1 obtained in this way is a value set in advance in the mobility management equipment included in the MNO or the communication infrastructure of the MNO. Then, with the first set value A set to a value different from C1 and the second set value B set to a value different from the set first set values A and C1, the third set value C2 is set. is further acquired (S402). The device 100 verifies whether C2 is equal to C1, and if so, it is determined to be pattern one. If not, the device 100 further verifies whether C2 is equal to A (S404). If they are equal, the third set value C3 is obtained with A set to Null (S405), and depending on whether C3 is equal to C1 (S406), it is determined that pattern 2 or pattern 4 is used. be done. If not, a third setting value C4 is obtained with B set to Null (S407), and depending on whether C4 is equal to C1 (S408), pattern 3 or pattern 5 is determined. be judged.

If it can be determined by which pattern the MME 220 determines the set value, it is preferable to store the correspondence between the MNO identifier and the pattern in the device 200 . Since the mobility management facility identifier, such as the host name of MME 220, is included in the ULR, device 200 may store the association between mobility management facility identifiers and patterns. Although the MME 220 is illustrated as a single facility in FIG. 2, multiple MMEs may be included in the wireless communication infrastructure possessed by the MNO. For example, there are cases where MMEs are distributed by region to ensure geographical redundancy, or where MMEs exist individually after multiple communication carriers are integrated. Therefore, device 200 preferably stores patterns in association with both MNO identifiers and mobility management facility identifiers.

Since patterns adopted by MNOs may change without the knowledge of MVNOs or MVNEs, the correspondence between at least one of the MNO identifier and the mobility management facility identifier and the pattern is It is preferable to include the date and time such as the date and time when the date and time was stored.

In addition, depending on the plan that the subscriber has contracted with the MVNO or MVNE that provides wireless communication services using the wireless communication infrastructure owned by the MNO, it is assumed that the settings at the MNO will differ, so the MNO identifier and mobility The association between at least one of the management facility identifiers and the pattern may further include a plan identifier identifying the plan, such as a plan name. In this case, the MME 220 stores or has access to the range of subscriber identifiers subscribed to each plan, and based on the subscriber identifier included in the attach request from the subscriber terminal 210, , selects a pattern according to the plan, and determines values of one or more parameters used in the low power consumption state according to the pattern.

Although roaming is not specifically described in the above description, even if the MME 220 is a mobility management facility of an MVNO that issued the SIM of the subscriber terminal 210 or an MNO that is a roaming partner of the MVNE, the present invention can be used. is equally applicable.

Further, as an alternative form of the present invention, instead of sending CLR as a request for HSS 230 to detach from MME 220, to PGW (not shown) connected to communication infrastructure possessed by MNO, "Delete The device 200 may transmit a bearer deletion request transmission request called "Bearer Request" to cause the MME 220 to transmit a detach request to the subscriber terminal 210 via the PGW. After receiving the bearer deletion request transmission request, the PGW transmits the bearer deletion request to the MME 220 via the SGW (not shown) included in the communication infrastructure of the MNO. Send a detach request. The bearer removal request includes a specification that reattachment after bearer removal is required, which specification can be provided, for example, by setting the Cause value "Reactivation Requested". The detach request also includes a specification that reattach is required as well, based on the specification included in the bearer deletion request. Thus, the request for detaching the subscriber identifier may be sent to the subscriber terminal 210 and is not necessarily sent directly to the MME 220 .

In the above description, 4G technical terms “SGW” and “PGW” are used, but “SGW” and “PGW” have both “functions on the C plane” and “functions on the U plane”. is doing. More generally, the function on the C-plane of the SGW is called "the gateway on the C-plane included in the communication infrastructure owned by the MNO", and the function on the U-plane is called "the gateway on the U-plane contained in the communication infrastructure owned by the MNO". gateway of The function on the C-plane of the PGW is called "the gateway on the C-plane connected to the communication infrastructure owned by the MNO", and the function on the U-plane is called "the gateway on the U-plane connected to the communication infrastructure owned by the MNO". gateway of PGW corresponds to equipment included in the communication infrastructure of MVNO or MVNE. CUPS (Control and User Plane Separation) may be applied to the SGW and PGW to separate the gateway on the C plane and the gateway on the U plane. In 5G, the “gateway on the C plane” corresponds to “SMF (Session Management Function)”, and the “gateway on the U plane” corresponds to “UPF (User Plane Function)”.

In the above-described embodiments, if there is no description of "only" such as "based on XX only", "only in response to XX", or "only in case of XX", in this specification, Note that it is envisioned that additional information may also be considered. Also, as an example, it should be noted that the statement ``do b in the case of a'' does not necessarily mean ``always do b in the case of a'' or ``do b immediately after a'' unless explicitly stated otherwise. want to be Moreover, the description of "each a constituting A" does not necessarily mean that A is composed of a plurality of constituent elements, but includes that the constituent elements are singular.

Also, just in case, any method, program, terminal, device, server, or system (hereinafter "method, etc."), even if there is an aspect that operates differently from the operations described in this specification, each of the present invention Aspects are directed to acts that are identical to any of the acts described herein, and that there are acts that are different from those described herein, the methods, etc. It should be added that it is not out of the scope of the embodiments.

200 device 201 communication unit 202 processing unit 203 storage unit 204 database 210 subscriber terminal 220 MME (corresponding to "mobility management facility")
230 HSS (corresponding to "subscriber information database")

Claims (5)

A method for managing settings of a wireless communication service provided using a wireless communication infrastructure owned by an MNO, wherein a server of an operator that provides the wireless communication service ,
requesting and receiving, from a subscriber terminal having a SIM, a first set value of a parameter used in a low power consumption state held in the subscriber terminal ;
making a setting request to a subscriber information database to hold a second setting value different from the first setting value in association with a subscriber identifier included in the SIM;
sending a request to the subscriber terminal to detach the subscriber identity, the detach requiring reattachment;
receiving a reattach completion notification from the MNO via the subscriber information database;
requesting the subscriber terminal for a third setting of the parameter after reattachment;
determining, at least partially, a procedure for determining the value of the parameter in the MNO, using the third setting value and differences between the first setting value and the second setting value. The method of claim 1 , wherein
The first setpoint and the second setpoint are different from preset setpoints for the parameter at the MNO. 3. A method according to claim 1 or 2 ,
An association between the determined decision procedure pattern and at least one of an MNO identifier that identifies the MNO and a mobility management equipment identifier that identifies a mobility management equipment that determines the parameter in the MNO is stored. A program for causing a server of an operator that provides a wireless communication service using a wireless communication infrastructure owned by an MNO to execute a method for managing settings of the wireless communication service , the method comprising:
requesting and receiving, from a subscriber terminal having a SIM, a first set value of a parameter used in a low power consumption state held in the subscriber terminal ;
making a setting request to a subscriber information database to hold a second setting value different from the first setting value in association with a subscriber identifier included in the SIM;
sending a request to the subscriber terminal to detach the subscriber identity, the detach requiring reattachment;
receiving a reattach completion notification from the MNO via the subscriber information database;
requesting the subscriber terminal for a third setting of the parameter after reattachment;
determining, at least partially, a procedure for determining the value of the parameter in the MNO, using the third setting value and differences between the first setting value and the second setting value. A device of an operator that provides the wireless communication service for managing the settings of the wireless communication service provided using the wireless communication infrastructure of the MNO ,
requesting and receiving, from a subscriber terminal having a SIM, a first setting value of a parameter used in a low power consumption state held in the subscriber terminal ;
making a setting request to a subscriber information database to hold a second setting value different from the first setting value in association with a subscriber identifier included in the SIM;
sending a request for detaching the subscriber identifier that requires reattachment to the subscriber terminal, and sending a request for reattachment from the MNO via the subscriber information database; receive notification of completion,
requesting the subscriber terminal a third setting value of the parameter after reattachment;
Differences between the third setting value and the first setting value and the second setting value are used to at least partially determine a procedure for determining the value of the parameter in the MNO.

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